A programmable look up table (LUT) structure that offers higher logic packing capacity over conventional LUT structures for programmable logic devices is disclosed. A programmable LUT structure comprising a first stage and one or more intermediate stages and a last stage, wherein at least one of said intermediate stages or the last stage further comprises: a primary input received in true and compliment logic levels, and an output; and two LUT values, said primary input coupling one of said LUT values to said output, wherein at least one of said LUT values further comprises: a secondary input and a configurable data value; and a programmable means to select either the secondary input or the data value as the LUT value.